Do you ...Center Channel?

I have a dedicated sound/ht room, and I don't use a center channel speaker,instead using 4 channels + the LFE channel. I have no problem with doing that. In my upstairs family room, I've tried it both ways, and now do not use a center channel. I find it too annoying, on mono movies, to only have sound coming out from on top of the tv. It sounds better to me, to have sound coming out of both main speakers. Do whatever feels good for you!
The only reason I know of, to have the center channel, is for people sitting off-center, to have the sound anchored over the tv. No one has ever complained about my setup, even tho upstairs the chairs are not centered.

in my family room system I have no center speaker - just run in "phantom" mode. In my dedicated home theater, I use a center speaker, but there are times (ie on some material) I wish I was running in phantom mode.

I use one, I could live without it though (depending on where I'm sitting).

Dave

I could live without it for TV/HT but find it essential for MCH music.

Kal

I always use one for HT, but not for music unless listening for 5.1 SACD, which I normally listen to in two channel as well.

I have an entertainment center which surrounds my TV. Equipment in the side tiers and center channel above. There is a gap between the top of my TV and the center speaker of ~ 4". I angle the speaker to face my listening position.